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Re: Use the A/C or the Windows...not both
Yes, the windows down gave the better mileage. The overall effect of having the windows down on total drag coefficient is very small. Windows down gives better mileage than A/C in almost every case. Certain exceptions exist I'm sure for certain vehicle shapes and particularly high-draw A/C units, but in general windows down is always the mileage saver.
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Dragging people kicking and screaming into the enlightenment.
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